100 Glassine Envelopes #6 measuring 3 3/4 x 6 3/4 inches These acid free archival envelopes are made of high quality glassine. They open from the top and have ungummed flaps. Each envelope measures 6-3/4" x 3-3/4". Ideal for all of your philatelic materials. Each order is for a pack of 100.